WHY IS THE GIANT MAGNETORESISTANCE PROPORTIONAL TO THE MAGNETIZATION FOR GRANULAR CUCO

Authors
MUSA SO HOWSON MA HICKEY BJ WISER N
Citation
So. Musa et al., WHY IS THE GIANT MAGNETORESISTANCE PROPORTIONAL TO THE MAGNETIZATION FOR GRANULAR CUCO, Journal of magnetism and magnetic materials, 148(1-2), 1995, pp. 309-310
Citations number
5
Categorie Soggetti
Material Science","Physics, Condensed Matter
Journal title
Journal of magnetism and magnetic materials → ACNP
ISSN journal
03048853
Volume
148
Issue
1-2
Year of publication
1995
Pages
309 - 310
Database
ISI
SICI code
0304-8853(1995)148:1-2<309:WITGMP>2.0.ZU;2-A
Abstract
We have prepared a melt-spun granular sample of Cu87Co13 in which the Cu matrix contains very small particles of Co that exhibit superparama gnetism. Both the giant magnetoresistance (GMR) and the magnetisation were measured, and we find that the GMR does not vary quadratically wi th the magnetisation. This unexpected result is attributed to the pres ence of a range of sizes for the superparamagnetic particles. Assuming a simple distribution of particle sizes, we calculated the magnetic f ield dependence of the GMR and find excellent agreement with experimen t.